Hvtprovement in furnaces for burning sawdust



UNITED STATES PATENT OFFICEo FERDINAND BRAUN, OF MIESBAOH, BAVARIA, ASSIGrNOl` TO JOSEPH HEINDLE, OF BROOKLYN, NEW YORK. 4

IMPROVEMENT IN FURNACES FOR BURNING SAWDUST..

Specification forming part of Letters Patent No. 42,816, dated May 17, 1864.

To all whom it may concern.-

Be it known that I, FERDINAND BRAUN, of Miesbach, in the Kingdom of Bavaria, have invented a new and Improved Furnace; and I do hereby declare that the following` is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure l represents a longitudinal vertical section of my invtntion. Fig. 2 is a transverse vertical section of the same. Fig. 3 is a plan or top view of the same.

Similar letters of reference in the three views indicate corresponding parts.

This inventian consists in the arrangement of a drying-room situated above the lire-place, and provided with a convex or roof shaped bottom and holes or channels leading down to the grate in such a manner that coal dust, waste peat, sawdust, spent tan, or other similur materials, when thrown in said heatingroom, will readily dry and feed themselves automatically to the grate.

It consists,further in the employment or use of a basket-grate, composed of a level bottom or center piece and inclined side pieces which extend up close under the holes or channels leading down from the dryingl room in such a manner that by racking lout the l slag from the flat center piece of the grate a fresh supply of fuel is allowed to descend over i the inclined side pieces without admitting l any air from above, and thereby the furnace is rendered self-feeding.

The invention consists, finally, in a flat or concave reiectors, built of brick or other suitable material, in combination with and in close proximity to the firegrate, and between it and the drying-room, in such a manner that the fresh fuel on arriving on the grate is exposed to the influence of the lire from below and to the heat radiated from the reflector from above, and thereby a more perfect and rated or slotted plates, or of a series of gratebars, according tothe nature of the fuel to be consumed. The middle section, b, of the grate is placed in a horizontal position, and the two side sections, a and c, are inclined at angles of about thirty-five degrees, (more or less,) so as to give to the grate the form of a basket. The inclination of said side sections must be so adjusted that the fuel ou dropping on them slides down over them to the central section, b, and the velocity with which the fuel arrives 011 said inclined planes ought to be so regulated that the fuel will spread evenly over the whole surface of the grate.

The fuel to be consumed, which may consist of coal-dust, waste peat, sawdust, spent tan, or other similar article or articles, is first dried in the drying-room D, Which is situated over the grate C, communicating with the same through holes, channels d, which lead to the highest portions of the inclined side sections, a and c. The bottom c of the drying-room is convex or roof shaped, causing the fuel to slide down automatically toward the channels d and through them to the grate C. This drying-room extends over the whole length of the grate, and a sufcient quantity of fuel is dumped into it to fill the same to some height above the apex of its roofshaped bottom.

The combustion 0f the fuel in the fire-place is facilitated by the reflector E, which is built over the grate C, and as close to it as circumstances will admit. It may be flat or curved, according to the shape of the cross-section of the grate and to the nature of the fuel to be consumed.

The fuel, on being dumped on the bottom of the drying-room, slides down toward the channels d, "and, passing through them, drops upon the inclined sides of the grate, and arranges itself upon the same in a stratum of uniform depth throughout.

It' the fuel is ignited, the heat radiating from the reflectors assist, in the combustion, and by removing the slag from the horizontal portion b of the grate, or, by stirring from below, so as to remove the ashes, the fuel on the grate is allowed to settle down, and the vacant space on top fills itself automatically through the channels d.

By this arrangement the labor of feeding the fuel tothe re is dispensed with. All that is necessary is to dump the fuel into the dryingroom, where it is exposed to the heat from below, and when dry it passes readily down on the grate. By the action of the reiiector E the consumption of the fuel is considerably facilitated, and inthis manner, by means of Very inferior fuel, a very powerful re can be produced. This fuel may be applied with advantage to steam-boilers, glass-furnaces, brickkilns, and ovens of any desired description.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The drying-room D, with a rootshaped 'or curved bottom, e, in combination with side channels, d, and tire-grate C, constructed and operating1 in the manner and for the purpose herein shown.v

2. The employment or use of the basketgrate C, composed of tWo inclined sections a c, and a horizontal section, b, in combination with the channels d, substantially as and for the purpose set forth'.

3. The application of the reflector E in combination with the tire-grate C, constructed with inclined sides, substantially as and for the purpose set forth.

FERDINAND BRAUN.

Witnesses A. F. SCHLEGEL, E. WOLFF. 4 

